Unfortunately I cannot utilize this service through Comcast/Xfinity as it requires Voice 2go per the following post at the site listed above, and I don't have and Android or Apple iOS device.
Quote:
Note: At this time, Nomorobo must be activated through Voice 2go, which is currently available only on Android and Apple iOS devices (i.e., tablets, iPod touches, smartphones) via the XFINITY Connect app. However, Comcast is evaluating additional ways for their customers to activate Nomorobo in the near future.
I'm looking forward to being able to activate Nomorobo via my landline service.